
# 渐变圆绘制
import turtle

number = int(input())    #把用户输入转成整数
turtle.screensize(600,500,'white')
turtle.pensize(3)        #设置画笔宽度为3
turtle.pencolor('blue')  #画笔颜色设置为蓝色
turtle.fillcolor('yellow') #设置填充颜色为黄色
turtle.begin_fill()        #开始填充
#turtle.forward(-50)

for i in range(3,number):
    turtle.circle(50,steps=i)
    turtle.forward(100)
turtle.circle(50,steps=number)
if number == 1:
    turtle.circle(50)
else:
    turtle.forward(100)
    turtle.circle(50)

turtle.end_fill()
turtle.hideturtle()     #隐藏海龟
turtle.done()
